The announcement will take place at the Penobscot Regional Chamber of Commerce business breakfast. Her speech starts at 8 a.m. (A previous version of this story indicated the speech would begin at 8:20 a.m. But the Senator's office has clarified the earlier start time.)

PORTLAND, Maine (AP) — Sen. Susan Collins' office says she'll make an announcement on Friday about whether she'll run for governor of Maine.

The moderate Republican was first elected in 1996 and has played a pivotal role in the Senate in recent debates about health care policy. She said previously that she would decide during the Senate's weeklong Columbus Day recess whether to stay in Washington or run for governor.